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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '203da60db8e9bca36fea04f30a56c6dc2fb3f072d561f50a2733d99583e2b4f6' 
  AND token = '1jgJNAq4jV9cUMDPCTSOSLegT2PUPdhO2mbV8PZzAwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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