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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5178c09f13a595ddc131156cf3b8faf77e081c1586366a81f675322d1de9f40f' 
  AND token = 'C5vMc5XFO49pgxkoQcJiX5RCOA/rl+XUxkfSYX6fhlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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