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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec9b326bd2f0d44f100f94b6dd1595985697e5b8e0256828d8445a798c8275c' 
  AND token = 'JQz63+EFV6kaT0vw5430qoyEhH/ioizgV5/VlrKGNiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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