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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd799743747bba357784935d9b8501864b47d639df7679bdf8c73099b1597835' 
  AND token = '9LQPYu2Yz+j8ilbuVaq/l8nOZMsE7rkoDBLZDvuVdqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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