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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a83b064bf442640faac74008020b2a812fe3a9ec9cf01a53f3c7427d8cc7277' 
  AND token = 'tIYVHgZXlCjauKfj6oH4pCwlH89cAEzKUggHVb0Z3DE=' 
  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"
    }
  }
}