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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f30d5b6ae181825ffe97e1471c3a1fd46f3b4de976ac6f53a175c87b56f2c6f' 
  AND token = '4Zzd85TK++q9V7LlmB3/5HLY34OwTXDOg278koo5aWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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