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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34259f8832700b69c8452f6172fc07777d65b39fbe0877b6af0ac8e0ad36a336' 
  AND token = 'bX17U6l3DrjdGYHNyrkUdxeMvpbbmYHwHt4o0LvaK2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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