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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab1303be3a4a27b54699ae9701221a573dbbd93dc2bb694eb1dc42b6020f4cf' 
  AND token = '4vkzrJka7y638wKUwD/9MwIqVj7wLm9VGhCNakDgcuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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