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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13efa11f041a2e817dcd28bbc2850276d6e00f98efa2bb557cc40d3c0d9dda6' 
  AND token = 'VL7Wp243D1sY08kbW+I62mDWFf6xLV3ypIWyft/cwYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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