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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd4424ad798e3738fb0a0b8461fe030dca82968d5dfed27c9ddf4f2c65c9db7d' 
  AND token = 'r2TvZW5WjmqjempH+p5hSF5Opn6QWWRUtOBjFrnT0Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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