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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd07d70a6317af23689198c015aef94ee34fd80600327d4c56226a494e402c9' 
  AND token = 'kFWSc+8/+6s+7P2Iw/dyBxECYplepwr1UdA4m9/sX6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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