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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c9982feb37918249301bdf035d945f4f80893498edd6948a58eded5aa08f4e' 
  AND token = 'aKe5whrj/PslFYS8XWCfHAAbQU9Gl2AKhOhD1l/vHxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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