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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a817d3f104c04fc2081d67963d575d9e94d58da1f9a478a1da62f5b08c4a8a7d' 
  AND token = 'HiOp6eZ5WbTqkSrHNoA2LnB6S9Tld2qXLEgOzS+GV+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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