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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffe59749b00be486cf6fa8def748073c6de314afd247241b9735b2fc201c9916' 
  AND token = 'Lu8XfhUy1Fn2NFX6B3/UCTYovLC1vb/+TrsW/l/9L7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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