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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e33a0ba615ccc26dd28b12f8ba0435fbcef1022a41869f169c860196ce37824' 
  AND token = 'ldk6puNHhSzAdoFm6k2cblZceYGJ9eg7U3HBLZo2r50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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