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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72ad4caa9b7fc1dc3fd2c558228b0c0ce0754ca012c151562e2724967c59d855' 
  AND token = 'fNQPWwgr2YhuRz+i1xCvGt04c5RjUkhnO5mxbZpFmmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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