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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bce579a13929c907746f26d085433c131d7383a06241ec43505658da40aa0f9' 
  AND token = 's2ht0V4ls8a+gz3LP+Z1zwtp9H7+ewEe/HNWdF3Tug0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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