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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b77744c8c999c4fb6cb66ad21e5dd98e02b1856132dc466915e5440f4c6ba8b4' 
  AND token = '6FG5QQVNAutnJDWTSNXQZu5NcUB8oZRJ0is8UNTzP6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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