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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f033bdc17a889aaa801275a7e20c8fa36ca71329a6be889dd81516cc634e4e5c' 
  AND token = 'tpYMeYoY8SletEXQOYxUQE4WNCdKJBLb/+VVjeZUdpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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