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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72ef5e036a4276674b4e4998dccd56577c1e0ef0d34cda2a71d047198c8a289e' 
  AND token = 'QJ9C5G0SNWRjCC/t+aDYLwIBinznfbNoSl0s7zW8Zhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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