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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdcf155da42d28b0812227542f5455f6df2d982f83993580ae27e3f3cd26d640' 
  AND token = 'WizVIzbyFPn66/jyHLdtaOcIuNG3kNwdrCKXPcw26j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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