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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f6e7b5dbf7e99d621699f9f7fd3fef3205ac3e33028ef2e8b77961f93ca370' 
  AND token = 'VlLk7uHR0cE7y7RU+7nFy3KyHCc5bpYbB1XCQmjRxD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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