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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e679d39a672f9e1cf57c4c264a50d86c4854f003aebea4db07844d7d23d956d0' 
  AND token = 'S8Zy6bolFn2Phewecxv7+f79TlAW2UJDZmLfnkFYKA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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