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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237031243b1ab12e044bf80363ac6a2f440381045e3629214d02cb337c42af46' 
  AND token = 't97ip+bBQmMhp3pjjMFD/6+66Xir6LuI6Bze11m9GZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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