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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ffad744782f23bf1b920ffba0e759a8d125144971814886369f92fd9eab59f1' 
  AND token = '6NJE0LIZ3ObVodsdmgGxQEes+DnU0d+Qx7QUpe7NKH4=' 
  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"
    }
  }
}