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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6243a538a21adbd0639f0174bfa0dc6b817546fda7d19e033303346e0f3b6683' 
  AND token = '0VVGObtj6CWCoRm2qWWZZ7xp/d1T2wuKTwURImy4zDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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