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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c6041ef3ab36465cad5f3033c2dc0f1cb21c36bad8095829ea01ff7ae4a172d' 
  AND token = 'ovnV6U792EXuI0ufUr5dkdUbhmQ3fBDUx2CbHTt7AMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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