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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75ab82563adf62202a5370a7f29d8c222769277727798380cefc7e8600d24b55' 
  AND token = 'A7Fn3Ei1NZNzMR0QSV2u1FzTYIHaqFbsRWD90l/Qjyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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