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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a8230f13f10a94eef27ef4ba3331084360a09ab7a09822f8d38f94f7894edb7' 
  AND token = 'uVkf6X8JBUzjgyyXX/NANw0oZgtarSfj2c6vi2mP6DQ=' 
  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"
    }
  }
}