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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f924c6911f2381b8e1a283b340aae80e27231f8e6527eab1c5e8edd75f25489' 
  AND token = 'Y8psB/Qe/c0suunvcU5GPi9HsDjws68lIE/DoVQU6ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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