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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22c68bae0cd55127b881f375c0e53189f9a8f26c134f493d5370b4f81d0396d5' 
  AND token = '2Wchi5g0G/aEk4onfI+lP2z07jz/50YRE7/GBfC/T5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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