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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db1f2453ae3f9cfeeb82228aa52f86105bac17bd61a0b717a1274d6d91c933e' 
  AND token = '40IfuVx/K7awS4VxO62jn8YjP1y8u1btS9wg9BMD/+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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