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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f35deebbe560b1bca305f4e2c04bc6407de41242e34fc8921e7195f25b1d1806' 
  AND token = 'j8lc9K29aoNC0EeBJx+iTKY5E+vxMhaG+4/jQKzvVFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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