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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0b55e57b01364ef8ceaf755a6e34eefb9dc14eacd76af569fab146f05c4caa3' 
  AND token = '0kkvqKVJx2nvovHCKfZ/nOnfslahhItkqLaxQzW6v0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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