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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0585ce541e4ec027e4f0f9c3144bf7cbdad8441ca5d4409d7351da12163f4e4' 
  AND token = '3ZeXJEy9lBEfT8LmqoE5QDmlaxGUNHhY/iih08xshR0=' 
  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"
    }
  }
}