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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '543ba37b77146c81b4fe239b8bc5a85f57ace15c3e52835c5439c26798a5c68f' 
  AND token = 'IKUFR8GTR6iFCAdAoYVHbAQOA7L2rJm4o/g2kEdUxn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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