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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '072e116c45c639273d92d08966d3f28c717fbbfade6cb12196a597986381b582' 
  AND token = 'nqOvBnB8P8brCNYJtdryj7MZY4defLf95gs9scZCInQ=' 
  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"
    }
  }
}