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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c0d85bd39a31ccd9e016c19504d03ff9954a76bd43c435ef23b612f73e968dd' 
  AND token = 'NkW1m2dJay2UqUKzwFt4Or8xMmSdta21xtAO/Rqmr78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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