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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f731d39270127fed42f5b7694c476b48a3aff509f253d72e943ce53e9bf7c1d2' 
  AND token = 'o/b0dCu6p7fEiilWXiGSKUsZJFfR5KpeIAjiqMmVsBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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