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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0275d12d13e149d2eb4a98d2129e503a77db2e843851f475d384f17cb3b895ef' 
  AND token = 'jv3/ZhUol0N37p2/5/8leLZaVc43vWWwp0TU8PxwquU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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