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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8de4eb9a35791963b4b28f1438b89662cd7008e93851a6f0062f3a28682c6dc4' 
  AND token = 'Nti532GfnSEQuHYiLUXZ/6XCkofVsyO3UBESRWQ0GKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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