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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4588770d4c0c885ddf6be89336a3a2e2dbb31c4f6b94a2f0ac9fb7bbd3c3be9' 
  AND token = 'fR3Egt9JtvvJsuo17z2Tels/EWVuvSL8+4waVNbvDpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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