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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc701843fcbedd4f783a0f1cce57a277a7757f6e335e6c1e5fa0a46df3b882c' 
  AND token = 'P2NKe2IStMvNLAw4XXruB+qONom2lvB5Rz0BhQXydy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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