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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '608e93e1f4bed1fbdbf6d28841985ecfbd0f83b995c9ce26300f741b8799d010' 
  AND token = 'WtGhkSfxyeOmUsuBcBhAQYwFe8r9Hwc/JPdIfva5J1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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