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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ddf3909e50706cab325f03770841c3851f045a8d42d6041f1982abc15b7f7d0' 
  AND token = 'c2BiziWEb0ehFSOvW8Y4zn/v/JNz6C94a7t8iyyq3hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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