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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81805092035f47b2e64fccc1cc8712dc1b25e4764962393a7e625f0eeb210015' 
  AND token = 'sgUpEgqD8Mad5GfMWL7agpTeX2t0IzYD9qz+9G5nePY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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