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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa7ae36db20479f6ac18868938ff01f763347f2afedd69e00639f941883b163' 
  AND token = '/mSjUFUdwWUyw88w3m9lP/7pT2ltwSjdHQuyKUqj6Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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