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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '350c08aac3e505dc0feb4f2c5a9a8ae27f1abbf5e075bca25dd3ef782b5b66d2' 
  AND token = '2LrLFnxinTOmD1sxHWfEiGQl6lFrJrE2ZU3Xjey1VJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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