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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3bbd6e3a695041e2d44f20fc2f8efeec3f42373badec49b878c94f6a1b31d20' 
  AND token = 'I+GBwEnS39V9irq26fys75+cxWvh3dsUgbN+wSMvuA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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