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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b44b7a5fa21e56b9d8fbb489199276196e5e8dd6d131b0afe14e395ebcd88b7' 
  AND token = 'LA0u+yRPmsOUuoLlML6i7h+ZKfM/uPtH+002FIakU/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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