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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c336733a6927104e0f657c9a12ac473a300103bbcf2c009726c9c3c562a4bfe6' 
  AND token = 'zBX5HDhS6n2SevkLSQl8yW8xXpW7bHaeWzIv6SeEfsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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