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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8261413f775a1b390f9f6cb25d1ae29e683180cd2f19f289b28194b7ba1413e8' 
  AND token = 'RR6ylHQDyrGqrPHmXBWHJJOBul+32OBEpmM44b+HXg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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