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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8172b2fe938c91053363e910befead0852f26c1f837ae9aaa48cae1041410288' 
  AND token = '2fjMLUSh2UF7/0F4I7Fe2qjTsLdq8Bt0w8uFkk/FsZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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