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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4255e23e7dd566ccb9ed19a70a6239c3da15cd2f7441040dcf74529e2bec6a74' 
  AND token = '6d51dpiGRUf4isnHpruBgBzqxYV3FAbQEs8nHAjHnf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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