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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8df14ebb08bffa465c2150bfb1ddafb7df4b7edcc5550ef673bcda3b3d1a1ce' 
  AND token = 'w5pOA9ayXQtxG5eo9Wy9tC1FAQD4ZhJGa6oPVg26bPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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