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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c05892ad1dc71d2de2fd1519fa61ae889a4ea95c728b6e9100e96eeb8d101157' 
  AND token = 'svzi9/2GqopbwvN8AzqEoH+zyykl9+7L5YYgkCmuXLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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