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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b352be788e7cc47ca2b973db3d5549127db2d7c494af73e5be5a91d2af25a6d' 
  AND token = 'RCORNk5ay2DRwEleKR1N8rDvyL0dxuKlK3eSKGh7R4I=' 
  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"
    }
  }
}