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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa805a3a729f146875b5ba4b96e0b540a4b104fdf7e2019c992d74d60809fb14' 
  AND token = '7PlLbuECFw6cicPkun4IUaYkb7fX91gnIuscWFyXAJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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