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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '129c57999a59cbe083d58aabc7cf3f47529e8490d8fd38273fe75b90437015d4' 
  AND token = 'nY3kc/4XEbOf7PmrpuzkF8Jkon53O4egRp87txHutgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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