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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8367883df2f24a6fe1b91c3e2db3ce746328e26493ebb2e511335c5a869e4e09' 
  AND token = 'oWrebQ5Rb4zWUFpu7xW/hV/snDYZm3Ki/M6GQB7pLWE=' 
  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"
    }
  }
}