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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05b1e6f8c310140c09df72aee60f29fbffe2a68a6758cbbaf30a784e2a40a44e' 
  AND token = 'wbWFlnn9CA+M60VKreuO6XE0p4e1zfADGLyWvqd2m58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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