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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096368ba29afbb4987ec10c934d18de283ef122a2c74cdba52ef8d4cbf472ff2' 
  AND token = 'BIwL0MRmE9tWpUE7A5jdtEu0kewB9kT6m6d8KiGT1xY=' 
  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"
    }
  }
}