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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93417ca5b2894617700d71f50ce1e1f5395694db1005d5b8ff93aae5b021c60' 
  AND token = 'ewWSGweqPblIqVmIylbR+MAI0/XWT8W43w/tbHYG4Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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