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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98554d7b92454564f757db5b34e8e219754792f33d305c7232a951c76ef75270' 
  AND token = 'DRdqMcbeowwbeZFH9C3lA/T74pGSlEe9garVf9Ec6nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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