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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e23869a973f6baff3ab0f95515513053d1ca72e063719d8aec215d9eaa1e89a' 
  AND token = '6Sww0kQjy5koPA4tnT/uJv8obhlScLD7L90jSa1WfR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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