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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19898b2ce529f27d01b8c4675de36c74b9641c098a467cd61aaf92a4e0c16ed8' 
  AND token = 'IveFTBnpMdkMz91dFNbv+yRntA596zG1SDMbj5x+LZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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