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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a441c321ba48bd5c220a79a20bb1283f321e191b5abc49c4b1842f4f5a6ae797' 
  AND token = '7nf4GjRdzL0OIGN7s47yGmJgSItl5J+HqtECG/hIloU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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