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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a21cf2dc875f3bd202f18391d23f0bb1a7edfa3a31468846ae159832d2d8f572' 
  AND token = 'M85OMLEgM8crgQd9fpEwBmlcsMdS959I/ohJVWgs6no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}