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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cc59d311f3486fb807eb4b922cf875b97a04bc914b9220e4b5fdd23db395bf9' 
  AND token = '+HkTFc5mM60tyV2f1XPsF8Ek7/dsqEeeFh2DHssYkE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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