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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3fcddb6868fd34f1ef93816887db384e0029d7e9012868bcda2ec1a7d8612c7' 
  AND token = 'QSxxrJ34DxHiC7YVYthwbw/snQfCv26THxJKGKCJ+v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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