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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa75dcc611eaf66622dd848c1cb71470bd73d321243663e11d0ac2e98b6f988d' 
  AND token = 'Zy3d7hUvifrqACMv2BPY5H7uSVBoUC86mOTwshP9f34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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